https://www.w3.org/standards/history/xforms-xpath/
XForms 2.0: XPath expression module publication history | Standards | W3C
The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web...
2 0xformsxpathexpressionmodule
https://www.w3.org/TR/xforms20/
XForms 2.0
2 0xforms